Superheater



E. A. GEOGHEGAN.

SUFERHEATER. APPLICATION HLED NOV. 8. 1917.

Patented J an. 6, 1920.

UNITED STATES PATENT OFFICE.

EDWARD A. GEOGHEGAN, OF CHICAGO, ILLINOIS, ASSIGNOR TO MILTON KRAEMERAND EDWARD J. TALBOTT, TRUSTEES.

SUPERHEATER.

Application filedNovember 8, 1917.

To all whom it may concern.

Be it known that I, EDWARD A. GEOGHE- GAN, a citizen of the UnitedStates, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful ImprovementsinSuperheaters; and I do hereby declare the following to be a full, clear,and exact description of the invention, such, as will enable othersskilled in the art to which it appertains to make and use the same,reference beinghad to the accompanying drawings, andto the letters ofreference marked thereon, forming part of this specification.

My invention relates to steam superheatcrs, and particularly to thattype of such apparatus as are mounted in furnace settings of their ownand are provided with mechanical stoking apparatus.

The object of my invention is to provide such a superheating apparatus,which, in its operation will-supply'the steam with the required degreeof superheat without effecting any chemical change therein.

I accomplishthis objectby arranging a series of banks of verticallyinclined steam conveying tubes in asuitable furnace setting or heatingchamber, and connecting the upper and lower ends of the tubes of saidseveral banks by means of pairs of tube headers, said-pairs of headersbeing so connected thatthere willbe a continuous passage through saidheaders and banks of tubes from the intake tothe exit therefrom.

The features of my invention are hereinafter fully set forth and pointedout, and are illustrated in the accompanying drawings in which:

Figure 1, is a side elevationof a'steam superheating appartus embodyingmy invention mounted in an independent furnace setting.

Fig. 2, is a sectional view showing the plan arrangement of the lowerheaders, and their connections.

Fig. 3, is a plan view of the upper headers and their connections.

In these drawings the lower header tubes are indicated by the numerals lto 12 inclusive; and the upper headers are indicated by the numerals 13to 24 inclusive. The lower headers are connected in pairs by means ofbranch pipes, A, B, C, D, E, and F; and said branch pipes are connectedin Specification of Letters Patent.

Patented Jan. 6, 1920.

Serial No. 200,919.

pairs by meansof the pipes A, C and E; -and the upper headers areconnected in pairs by-means of branch pipes G, H, I, J, K and L and thebranch pipes H and I are connected by means of the pipes H and thebranch pipes J and K are connected by means of the pipe J; while a steamsupply pipe M is connected with the branch pipe G, and a steam exit pipeN is connected with the branch pipe L.

1 As shown in Fig. 1, the lower headertubes l and 2, are connected withthe upper header tubes 13 and it by means of the banks of tubes a a; thelower header tubes 3 and 4 with the upper header tubes 15 and 16 bymeans of banks of tubes 1) b; the lower header tubes 5 and 6 with theupper header tubes 17 and 18 by means of banks of tubes 0 c; the lowerheader tubes 7 and 8 with the upper header tubes 19 and 20 bymeans ofbanks of tubes (Z (Z; the lower header tubes 9 and 10 with the upperheader tubes 21 and 22 by means of banks of tubes 6 e; and the lowerheader tubes 11 and 12 with the upper header tubes 23 and 24k by meansof banks of tubes f f; so that steam entering the upper headers 18 and14: through the intake pipe-M and branch G, passes downwardly throughthe banks of tubes a a into the lower headers l and 2; thence throughthe pipes A A, and B into the lower headers 3 and 4; thence upwardlythrough the banks of tubes Z) 6 into the upper headers 15 and 16; thencethrough the pipe H, H and I into the upper headers 17 and 18; thencedownwardly through the banks oftube-s c 0 into the lower headers 5 and6; thence through the pipes C, C and D into the lower headers 7 and 8;thence upwardly through the banks of tubescZ .(Z into the 11pperheaders19 and 20; thence through the pipes ,J J and K'into the upper headers 2land 22; thence downwardly through banks of tubes 6 6 into the lowerheaders 9 and 10; thence through the pipes E E and F into the lowerheaders 11 and 12; thence upwardly through banks of tubes 7 7 into theupper headers 23 and 2st; thence through the pipe L to the exit pipe N.

The apparatus above described is inclosed in a suitable furnace settingconsisting of the rear wall 0, side walls P, front wall Q, cover arch S,bottom T, and fire back wall U. The furnace is preferably provided witha mechanical stoker mechanism Q, of any desired type, although it may bearranged for manual stoking.

The chamber back of the fire wall U is provided with transverse bafflesg, h, i, and I preferably place a horizontal baffle j immediately underthe upper tube headers, so that fire gases rising upwardly in front ofthe fire Wall U pass rearwardly over said wall and among the banks oftubes 0; a and Z) Z); thence under the lower end of the baflie g andupwardly among the banks of tubes Q0 and cl; thence over the upper endof the baflie it and downwardly among the banks of tubes (Z and e e;thence upwardly among the banks of tubes 7 7" toward the smoke exit V.

In operation saturated steam is introduced into the first pair of upperheaders 13 and 14 immediately above the fire-grate Q, and passes throughthe super-heater apparatus as hereinbefore described, and the fire gasesat their greatest heat impinge upon the banks of tubes at a whichcontain steam as it comes from the generator, and during its passagethrough the tubes a a the strata of steam contacting with the innersurface of the tubes a a by the action of heat, becomes somewhat drierthan the inner portion of the column of steam within each of the tubesof the banks a a, and when the steam enters the lower headers 1 and 2,it is partially mixed by being brought into a sin gle body in each ofsaid headers 1 and 2; and said mixing is carried a step further byuniting the steam from the two headers 1 and 2 in a single body, andagain subdividit by causing it to pass through the pipes A, A and B intothe lower headers 3 and 1, from whence it is again subdivided among thetubes of the banks 6 b; the stratification. of steam mentioned in thebanks a a, is thus broken up and the vapor particles thoroughlyintermixed during the steams passage from the banks of tubes into theheaders, and from one pair of headers into the succeeding pair ofheaders. It will be noted also that when the steam is being acted uponby the hottest fire gas, it is the wettest, and can absorb a high degreeof heat without having its chemical content disassociated and the oxygenabsorbed by the metal of the tubes; and it will be noted also that asthe steam passes through the successive banks of tubes, and becomesprogressively drier therein, the heat of the firegas outside of thetubes becomes progres sively lower, so that the oxygen will not havebeen burned out of the steam; or in otherwords, it will not have beenabsorbed by the metal walls of the tubes, (which as is well known, havea great affinity therefor,)

thereby leaving a residue comprised almost entirely of hydrogen gas, tobe delivered into the exit pipe N.

This result is obtained by breaking up the dry and moist stratas ofsteam in the banks of tubes as it passes from bank to bank andthoroughly intermixing the vapor particles during the passage from onebank to the next; and by reducing the heat as the dryness of the steamincreases.

Having thus described my invention, and illustrated suitable apparatusfor embodying the same, I do not desire to limit myself to the exactarrangement of apparatus shown and described, as it is obvious that manychanges and modifications can be made therein without departing from thescope of my invention; therefore what I claim as new and desire tosecure by Letters Patent is:

In an apparatus of the class described, a furnace chamber, a fire-gratetherein, a firewall behind said grate, an intake returnbend header tubeabove said fire-grate, a series of succeeding return-bend header tubeson the plane of and behind said intake header, a fire-bafie under saidheaders, vertical return-bend pipe connections connecting saidreturn-bend headers in alternate pairs, so that the last header becomesa discharge header, a series of return-bend tube headers under'the firstnamed headers and behind said fire-wall, vertical return-bend pipeconnections connecting said lower headers in alternate pairs instaggered relation to said upper headers, inclined superheater tubesconnecting the first and succeeding upper headers with the first and (IEDWARD A. GEOGHEGAN.

